Emergency vaccines to prevent a re-emerging disease. 30 years after it was eliminated, polio returns to the US.

The polio virus has been found in New York City sewage, but officials are stressing that the highest risk is for people who haven't been vaccinated.

Polio was once one of the nation's most feared diseases, with annual outbreaks causing thousands of cases of paralysis. Its elimination in the U.S., officially declared in 1979, is considered one of the nation's greatest public health victories. Yet cases have cropped up occasionally since then, often among people who had traveled to other countries.

Recently, an unvaccinated young adult north of New York City contracted polio. On Friday, health officials in the nation's largest city said they had found the virus in wastewater samples, suggesting it was spreading among the unvaccinated.

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The Associated Press Health & Science Department receives support from the Howard Hughes Medical Institute's Department of Science Education. The AP is solely responsible for all content.

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